1. A Grid Based IMS Learning Design Player the ELeGI Case Study Nicola CAPUANO, Roberto IANNONE, Sergio MIRANDA and Marcello ROSCIANO CRMPA, Centro di Ricerca in Matematica Pura ed Applicata DIIMA, University of Salerno MOMA, Modelli Matematici e Applicazioni SWEL 2007 @ AIED 2007 - Ontologies and Semantic Web Services for Intelligent Distributed Educational Systems

2. grid.noe-kaleidoscope.org - slide 2 of 22 What is ELeGI  European Learning Grid Infrastructure is an FP6 Integrated Project whose objectives are:  To create new potential for ubiquitous and collaborative human learning, merging experiential, personalized and contextualized approaches  To define and implement an advanced service-oriented Grid based software architecture for learning  To validate and evaluate the software architecture and the didactical approaches through the use of Pilots and Demonstrators

3. grid.noe-kaleidoscope.org - slide 3 of 22 What is IMS Learning Design  It is a specification which describes learning scenarios that can be presented online and shared between systems and learners  Through Learning Design it is possible to:  Describe and implement learning activities based on different pedagogies  Coordinate multiple learners and roles within a multi-learner model  Coordinate the use of learning content with collaborative services  Support multiple delivery models  Transfer learning designs between systems  Reuse learning designs and materials  Perform tracking, reporting, and performance analysis

4. grid.noe-kaleidoscope.org - slide 4 of 22 Method Components Play Act 1Act 2Act 3Act 4Act 5 Role-part 1 Role-part 2 Role-part 3 Role-part … Role Activity Environment Learning objects Learning services What is IMS Learning Design

5. grid.noe-kaleidoscope.org - slide 5 of 22 The ELeGI’s Learning Model  It describes the main entities involved in the learning process  It allows the automatic building and delivery of adaptive Units of Learning expressed in IMS Learning Design Knowledge Model Learner Model Didactic Model Represents the knowledge about the learning domain and connected learning resources Represents learning acquired competencies and preferences Defines the optimal modalities of knowledge building

6. grid.noe-kaleidoscope.org - slide 6 of 22 Learning Resource First Level Ontology Third Level Metadata Second Level Titolo Tipologia Keyword Concetto … The Knowledge Model

7. grid.noe-kaleidoscope.org - slide 7 of 22 A Sample Ontology Metadata Theorem ------ ----- --------- R= Requires SO= Suggested Order BT= Belongs To Limits Integrals Series Derivatives Analysis R R R SO BT

8. grid.noe-kaleidoscope.org - slide 8 of 22 The Learner Model  Cognitive State What does the learner know?  Stores the knowledge of every learner about domain concepts  It is updated after each test activity  Preferences How does the learner prefer to learn?  Stores learner preferences about several pedagogical parameters like:  media, didactic approach, interactivity level, semantic density, difficulty, etc.  It is updated after each test activity

9. grid.noe-kaleidoscope.org - slide 9 of 22 Unit of Learning Building LimitsIntegralsDerivatives Theorem ------ ----- --------- Explain. ------ ----- --------- Test ---- x ---- o ---- x Limits Integrals Series Derivatives Analysis R R R SO BT R= Requires SO= Suggested Order BT= Belongs To

10. grid.noe-kaleidoscope.org - slide 10 of 22 The Didactic Model  We can use Learning Design but …  it implements domain-dependent pedagogies the instructional designer is forced to establish “a priori” the didactic domain, building the environments tied to the scenario’s activities  learning processes cannot be really adaptive plays cannot take into account learner needs and preferences and adapt accordingly the learning activities  it can’t exploit advantages of the Grid for learning the early binding of resources thwarts the opportunity for dynamic selection of distributed learning objects and services that best fits learning needs

11. grid.noe-kaleidoscope.org - slide 11 of 22 The Didactic Model  The solution is to build abstract pedagogies without specifying concrete environments for each activity in the play LRT= Learning Resource Type IL= Interactivity Level IT= Interactivity Type I

12. grid.noe-kaleidoscope.org - slide 12 of 22 Updating the Knowledge Model R= Requires SO= Suggested Order BT= Belongs To Limits Integrals Series Derivatives Analysis R R R SO BT D I D I I D = Inductuive/Experiential = Deductive

13. grid.noe-kaleidoscope.org - slide 13 of 22 Unit of Learning Building Limits Integrals Derivatives D I I

14. grid.noe-kaleidoscope.org - slide 14 of 22 1. The Unit of Learning requests a Learning Service 2. The Player finds on the GRID a suitable Learning Service 3. The selected Service sends back a Portlet Handle An Example Scenario 4. The Portlet is aggregated in the whole Unit of Learning interface and sent back to the Learner

15. grid.noe-kaleidoscope.org - slide 15 of 22 Service Discovery and Binding  Each Learning Service  must be a WSRF compliant GRID service  must extend a class provided by the supplied API  must use WSRP Portlet to expose service interface  An XML service description is included into the Unit of Learning in place of the real service  It may exploit two service discovery methods:  Static address specification A service address is used to instantiate it  Dynamic address specification An SLA containing the information needed to retrieve a service is used

16. grid.noe-kaleidoscope.org - slide 16 of 22 Service Discovery and Binding

17. grid.noe-kaleidoscope.org - slide 17 of 22 Service Discovery and Binding Service URL address. If not specified the dynamic address specification method is used.

18. grid.noe-kaleidoscope.org - slide 18 of 22 Service Discovery and Binding Used by GRID middleware to search for suitable service.

19. grid.noe-kaleidoscope.org - slide 19 of 22 Service Discovery and Binding Specifies service needed parameters

20. grid.noe-kaleidoscope.org - slide 20 of 22 Dynamic Binding IMS LD-Player […]

21. grid.noe-kaleidoscope.org - slide 21 of 22 The Result IMS LD Player Matchmaking WSRP portlet

22. grid.noe-kaleidoscope.org - slide 22 of 22 Conclusion  We presented an approach able to:  automatically build a Unit of Learning based on three models (knowledge, learner and didactic)  design domain-independent pedagogies with IMS-LD  enable the automatic discovery and late binding of learning resources and services  The approach and the related software were developed in the context of ELeGI project  More info on www.elegi.org